Localized corrosion of ultrafine-grained Al–Mg model alloys

Brunner, J.; May, Johannes; Höppel, Heinz Werner; Göken, Mathias; Virtanen, Sannakaisa

doi:10.1016/j.electacta.2009.11.016

Cited by 90 publications

(44 citation statements)

References 18 publications

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“…Contrary results were reported for Al-Ni and Al-Cu alloys containing other second phases [6]. In an Al-Mg model alloy [7], more localized and deeper pits were found in the UFG condition. Furthermore, the pitting potential evidenced influence of the number of ECAP passes.…”

Section: Pit Morphologymentioning

confidence: 40%

“…Ralston et al [9] correlate the corrosion rate in terms of oxide formation and film ion conduction with reactive surfaces provided by enhanced grain boundary density. Brunner et al [7] found a lowered pitting potential due to the transition from CG to UFG material but no significant influence with the number of ECAP passes. The pit morphology after polarization occurred less crystallographically, deeper and more localized in the UFG material compared to the CG material in which laterally spreading crystallographic filiform corrosion dominated.…”

Section: Introductionmentioning

confidence: 99%

“…In electrochemical studies used to investigate the susceptibility to pitting, the pitting potential marks the breakthrough of the passive layer. In high-purity aluminum and single-phase aluminum model alloys, the pitting potential is lowered [6,7] or unaffected [8] compared to the CG material and is ascribed to the effect of grain refinement. Ralston et al [9] correlate the corrosion rate in terms of oxide formation and film ion conduction with reactive surfaces provided by enhanced grain boundary density.…”

Section: Introductionmentioning

confidence: 99%

“…The pit morphology after polarization occurred less crystallographically, deeper and more localized in the UFG material compared to the CG material in which laterally spreading crystallographic filiform corrosion dominated. The dislocation density and the deformation state were supposed to be the dominating factors for the different propagation mode of pitting corrosion: propagation in depth for UFG and laterally spreading for CG material [7]. The variation in passive film stability and the existence of local galvanic cells stimulate the anodic dissolution of the surrounding matrix material.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Nickel

Dietrich

Mehner

et al. 2015

Metals

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Abstract:The corrosion susceptibility of an age-hardened aluminum alloy in different processing conditions, especially after a single pass of equal-channel angular pressing (ECAP), is examined. The main question addressed is how corrosive attack is changed by strain localization. For that purpose, an AlMgSi0.5 alloy with a strain localized microstructure containing alternating shear bands was subjected to potentiodynamic polarization on a macro-scale and micro-scale using the micro-capillary technique. Pitting potentials and the corrosion appearance (pit depth, corroded area fractions and volumes) are discussed with respect to microstructural evolution due to casting, extrusion and ECAP. Size, shape and orientation of grains, constituent particle fragmentation, cell size and microstrain were analyzed. Stable pitting of shear bands results in less positive potentials compared to adjacent microstructure. More pits emerge in the shear bands, but the pit depth is reduced significantly. This is attributed to higher microstrains influencing the stability of the passivation layer and the reduced size of grains and constituent particles. The size of the crystallographic pits is associated with the deformation-induced cell size of the aluminum alloy. OPEN ACCESSMetals 2015, 5 173

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Section: Pit Morphologymentioning

confidence: 40%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Strain Localization on Pitting Corrosion of an AlMgSi0.5 Alloy

Nickel

Dietrich

Mehner

et al. 2015

Metals

View full text Add to dashboard Cite

show abstract

“…Последнее время основное внимание уделяется исследованию влияния гра-ниц зёрен на коррозию [1][2][3][4][5][6][7][8][9][10]12]. Влияние дислокаций на скорость коррозии изучено значительно слабее.…”

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